Scurvygrass growing on busy roadside.
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This plant was once decidedly scarce in the north east of England (being coastally restricted). Now, it is everywhere, at least in a linear network along all of the main roads - wherever heavy gritting takes place. It would appear to have tracked the salt along the verges and it now forms a 15-25cm or so wide, white-flecked corridor in April of most years. I first noted its significant spread about 12 years ago, though I am sure that it was occurring before that.
Lat/Lng: 51.311444, -0.747613
OS grid ref: SU873576